National Security Council Ukraine expert Lieutenant Colonel Alexander Vindman and Jennifer Williams, an aide to Vice President Mike Pence take the oath before they testify during the House Intelligence Committee hearing, into President Donald Trump's alleged efforts to tie US aid for Ukraine to investigations of his political opponents, on Capitol Hill in Washington, DC on November 19, 2019. - President Donald Trump faces more potentially damning testimony in the Ukraine scandal as a critical week of public impeachment hearings opens Tuesday in the House of Representatives. (Photo by Andrew CABALLERO-REYNOLDS / AFP) (Photo by ANDREW CABALLERO-REYNOLDS/AFP via Getty Images)
